确定深埋海洋碳酸盐中的沉积环境和相关能量:天然伽马射线光谱记录的启示

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Frontiers of Earth Science Pub Date : 2023-12-28 DOI:10.1007/s11707-022-1053-7
Jingyan Liu, Qian Chang, Junlong Zhang, Hui Chai, Feng He, Yizan Yang, Shiqiang Xia
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引用次数: 0

摘要

确定深埋海相碳酸盐岩的古沉积环境和相关能量一直是一项挑战。能量代表碳酸盐沉积时的水动力条件。能量包括化合物中的光能和化学能,以及水流和质量流中的动能。塔里木盆地东部奥陶纪沉积时期沉积的深埋海相碳酸盐是构造、沉积和成岩作用复杂相互作用的结果。因此,确定古代沉积环境和相关能量是非常复杂的。本文利用天然伽马射线光谱仪(GRS)测井记录(来自 12 口井)对深埋海相碳酸盐岩的沉积环境和相关能量进行了研究。研究结果表明,天然伽马能谱测井中的钍(Th)、铀(U)、钾(K)和不含铀的伽马射线(KTh)值可以揭示岩性关联、矿物组成、成岩环境、地层水活动和古气候变化。在奥陶纪期间,利用 GC4 井、GC6 井、GC7 井和 GC8 井典型井(用岩心和薄片穿透奥陶纪)的天然 GRS 测井参数的综合计算,对沉积环境能量进行了定量分析和测定。结果表明,与筛余物测井相比,GRS 测井能确定典型油井中不同的岩性关联。此外,岩心和薄片也可用于验证岩性关联的确定。在确定岩性关联的基础上,可采用新方法分析反映沉积环境和相关能量的岩性关联。此外,从天然 GRS 测井中得出的沉积环境能量曲线可以揭示沉积时期的水动力波动,这将有助于发现碳酸盐岩储层、建立层序地层框架以及重建未来的海平面变化。
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The determination of sedimentary environment and associated energy in deep-buried marine carbonates: insights from natural gamma ray spectrometry log

It has always been challenging to determine the ancient sedimentary environment and associated energy in deep-buried marine carbonates. The energy represents the hydrodynamic conditions that existed when the carbonates were deposited. The energy includes light and chemical energies in compounds and kinetic energy in currents and mass flow. Deep-buried marine carbonates deposited during the Ordovician depositional period in the eastern Tarim Basin result from a complex interplay of tectonics, sedimentation, and diagenesis. As a result, determining the ancient sedimentary environment and associated energy is complex. The natural gamma-ray spectrometry (GRS) log (from 12 wells) is used in this paper to conduct studies on the sedimentary environment and associated energy in deep-buried marine carbonates. The findings show that the values of thorium (Th), uranium (U), potassium (K), and gamma-ray without uranium (KTh) in a natural GRS log can reveal lithological associations, mineral composition, diagenetic environment, stratigraphic water activity, and ancient climatic change. During the Ordovician, quantitative analysis and determination of sedimentary environment energy are carried out using a comprehensive calculation of natural GRS log parameters in typical wells (penetrating through the Ordovician with cores and thin sections) of well GC4, well GC6, well GC7, and well GC8. The results show that GRS log can determine different lithology associations in typical wells than a sieve residue log. Furthermore, cores and thin sections can be used to validate the determination of lithology associations. Based on the determination of lithology associations, the lithology associations that reflect the sedimentary environment and associated energy can be analyzed in a new approach. Furthermore, the sedimentary environment energy curve derived from a natural GRS log can reveal hydrodynamic fluctuations during depositional periods, which will aid in the discovery of carbonate reservoirs, establishing sequence stratigraphic frameworks, and the reconstruction of sea-level changes in the future.

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来源期刊
Frontiers of Earth Science
Frontiers of Earth Science GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.50
自引率
5.00%
发文量
627
期刊介绍: Frontiers of Earth Science publishes original, peer-reviewed, theoretical and experimental frontier research papers as well as significant review articles of more general interest to earth scientists. The journal features articles dealing with observations, patterns, processes, and modeling of both innerspheres (including deep crust, mantle, and core) and outerspheres (including atmosphere, hydrosphere, and biosphere) of the earth. Its aim is to promote communication and share knowledge among the international earth science communities
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